fix(visual): 1:1 banner/hero/modal + strip non-zibll card chrome

Align banner s-desc caption/scale-height, hero search pill and -40px cards, modal colorful header/spring scale; remove white/pink card borders and hover lifts across mainline surfaces.

assets/css/routes/auth.css

@@ -20,7 +20,7 @@
   width: 100%;
   max-width: 440px;
   background: var(--surface-1);
-  border: 1px solid rgba(255, 255, 255, 0.55);
+  border: none;
   border-radius: var(--radius-2xl, 16px);
   padding: 32px;
   box-shadow: var(--shadow-sm);
@@ -231,7 +231,7 @@
   align-items: center;
   justify-content: center;
   border-radius: 50%;
-  border: 1px solid rgba(255, 255, 255, 0.55);
+  border: none;
   background: var(--surface-4);
   box-shadow: var(--shadow-sm);
   color: var(--color-ink);